Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
cua nhung » va nhung
phong van » phung van, thong van, hong van
hoc hieu » hoc thieu, doc hieu, hoc dieu
phong va » thong va, phung van, thong van
tai cao » thai cao, tao cao, tai sao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc hieu) or (hoc hien)) lang - hanh tranh cua nhung ((phong van) OR (phong va)) tai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hieu) OR (hoc hien)) lang - hanh tranh cua nhung ((phong van) OR (phong va)) tai cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hieu) or (hoc hien)) lang - hanh tranh cua nhung ((phong van) OR (phong va)) tai cao".
• Adding a wildcard symbol may retrieve word variants: ((hoc hieu) or (hoc hien)) lang - hanh tranh cua nhung ((phong van) OR (phong va)) tai cao*.